ProbabilityPlayer vs Calculus Gacha！
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ProbabilityPlayer
Practice probability problems for the Kyotsu Test, a common Japanese university entrance exam. This app focuses on mathematical probability questions and includes diagrams to aid understanding. It is designed to help students prepare for this specific academic assessment.
- Probability problem practice
- Kyotsu Test focus
- Mathematical probability
- Diagrams included
- University entrance exam prep
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This is an app for Kyotsu Test, the test widely used in Japanese university entrance exams, dealing especially with probability problems in mathematics. I have applied to the rights holder to use the test.
Calculus Gacha！
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● Fun, Gacha-Style Learning Tackle randomly selected questions and instantly check explanations and formulas as you go. ●AI Tutor Stuck on a problem? Ask the built-in AI tutor for a hint, a solving strategy, just the first step, or an explanation using a simpler similar problem — all tailored to the question you're working on. ● Learn by Topic Integration, limits, factorization, indeterminate equations, recurrence relations, differential equations, and more. Each topic is organized into categories so you can focus on exactly what you want to study. ● Helpful Support Features Hints, scratch paper, a timer, and other tools make learning smoother and more efficient. ● Automatic Study Tracking All solved questions are saved on your device, allowing you to review your progress and understanding anytime. ● Smart Question Selection Based on your learning history, the app prioritizes topics you struggle with, helping you learn more efficiently. --------------------------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.notion.so/calculus-gacha-joy-math-27ae4f0afd3b80cb9754ce138cbc80ca?source=copy_link
Screenshots
Verdict
The clearest difference is update cadence: Calculus Gacha！ at every 2 days against ProbabilityPlayer's monthly. Calculus Gacha！ also leads on iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase and Calculus Gacha！ sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
ProbabilityPlayer ships an update monthly, Calculus Gacha！ every 2 days. The most recent releases landed on September 27, 2026 and September 25, 2026 respectively.
| Parameter | ProbabilityPlayer | Calculus Gacha！ |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | Motonari Hibi | Shunsuke Nakamura |
In-app purchases
ProbabilityPlayer
- Premium$1.99
Calculus Gacha！
- 不定方程式ガチャ利用オプション$0.99
- AI Tutor Plus(500)$2.99
- 履歴管理機能オプション$2.99
Questions
Is ProbabilityPlayer free?
Is Calculus Gacha！ free?
Do ProbabilityPlayer or Calculus Gacha！ have ads?
Which is updated more often, ProbabilityPlayer or Calculus Gacha！?
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